Help upgrade of esxi5.0 to 5.1 has gone wrong

So, downed the VM's.
Put the host in maintenance mode.
Rebooted
Upgraded to v5.1
Then had issues with DNS on vsphere client as VM's virtual
Managed to log into the host (local storage) with onboard SD card with install
powered up VMs and had message;

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The following article is comprised of the pearls we have garnered deploying virtualization solutions since Virtual Server 2005 and subsequent 2008 RTM+ Hyper-V in standalone and clustered environments.

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